Illegal character in slur symbol

[Barry Gold]

I originally set this piece with "normal" ties and slurs, and of course
it printed with dashes to extend the syllables over the tied notes.  I
don't like that, so I decided to use the (( and )) symbols instead and
create null syllables {} to put under the second and succeeding notes of
the slurs & ties.

The input passes through prepmx without problems, but I'm getting the
following error message from PMX:

 Starting first PMX pass

  Bar 1  Bar 2  Bar 3  Bar 4  Bar 5  Bar 6  Bar 7

 ERROR in line 46, bar 9 Illegal character in slur symbol
      v
 b2d s) | /
      ^
1

Thanks for any help you can give.

I'm attaching the source.
Meter: 3/4
Style: SINGER
Space: 1
% Bars/Line: 6
Pages: 1
Systems: 8
% PMX: h9.8i
% PMX: w7i
% PMX: Ar

%% \\let\endpiecesav\endpiece\ 
%% \\def\endpiece{\endpiecesav\vfill\ 
%% h9.8i
%% w7i
% % %% Ar K+0+0
% %% \\input bdgmusic\ 
% %% \\pageno=6\ 
%% \\hoffset=.05in\voffset=.3in\nobarnumbers\ 
%% \\font\twelverm=cmr12\ 
%% \\font\sevtrm=cmr17\ 
%% \\def\emdash{\thinspace---\thinspace}\ 
%% \\def\hy{\thinspace-}\ 
%% \\def\chorus{\sevtrm\bf{Release:}}\ 
% %% \\headline{\twelverm XenoFilkia \#71\hfill page 1424}\ 
% %% \\line{\twelverm ~\hfill}\ 
% %% \\line{\twelverm ~\hfill}\ 
% %% Ar
% %% \\line{\twelverm ~\hfill}\ 
% %% \\line{\twelverm GHOST WALTZ\hfill}\ 
% %% \\line{\twelverm Words and Music \copyright~by Dave Luckett\hfill}\ 
U: @+1 Em       |              | C
   @-3 e2  f4   | g2     a4    | b2 c4  | d2   c4 |
L:     Sha-dows   slide, where   fi-res   died in

U: Am       | C      |   Em
   b2 a4    | g2 a4  | (( b2d    | b2d )) |
L: si-lent,   em-pty      rooms.   {}

U: Em      |           | C
   e2- f4  | g2    a4  | b2 c4  | d2   c4 |
L: Sil-ken   soft, the   ee-rie   waft of

U: Am        | D        |   G
   b2 a4     | g2  a4 | (( b2d | bd )) | 
L: Li-lith's   own per-fume.     {}

U:   C  |      |   G  |      |   Am |          |   Em
   (( ed | ed )) | (( bd | bd )) | (( ed | e4 f e )) | (( b2d | bd )) |
L:    Ai,  {}         me!  {}         Ai,  {} {} {}       me!   {}

U: Am        | C         | Am    | C
   b2    c4  | d2     c4 | b2 a4 | g2     a4  |
L: Round and   round, for-e-ver    bound, The

U: Am       | D      |   Em
   b2  a4   | g2 f4  | (( e2d   |  ed )) |
L: dan-cers   in the      gloom.   {}

U: C
   e+d | ed    | e4 f    g  | f2    e4   |
L: Some-times,   e-choes of   laugh-ter,

U: G
   e (( b2 | bd )) | b4 a  g   | b     a  g  |
L: spil-ling {}      in-to the   night {} And

U: Am  |     | C       | D         |   Em
   a2d | ad  | c4 d  e | d2   c4   | (( b2d | bd )) |
L: chil-ling   in-to a   slee-ping      ear.  {}

U: C  |     |                |         | Am
   ed | ed  | e4     f  g    | f2   e4 | e2d |
L: Lis-ten!   You'll al-most   hear it.  (No,

U:
   e2d | e4    f  g   | f2   e4   |
L: not   quite do you   hear it!) 

U: D   |     |              |       |   F#m | F#
   f2d | f2d | f4    g  a   | g2 f4 | (( f2d    | fd ))
L:   Ne-ver    quite do you   e-ver      hear.... {}